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Patching a kubernetes object with kubectl patch and a patch file
2 min read
We can use the kubectl patch command with the -p option to update an existing kubernetes object:
$ kubectl patch sc gp2 -p '{"allowVolumeExpansion": true}' storageclass.storage.k8s.io/gp2 patchedWhen the patch is small is a very convenient way of patching it but as the patch grows it becomes less convenient
19/09/2022
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Kubernetes: Apply parts of a manifest by labels
2 min read
Sometimes we might have a manifest file with a lot of objects in it but we don't really need them all. We can use it's labels to install just the objects that have a specific label.
15/09/2022
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Install minikube on an Apple Sillicon without Docker Desktop
4 min read
If you try to install minikube on an Apple Sillicon (such as Apple M1, M2...) you will face that some hypervisors doesn't support arm64 yet. Using Docker Destop, on the other hand, has recently changed it's license so it might not be suitable to you
$ minikube start 😄 minikube v1.26.1 on Darwin 12.5.1 (arm64) ✨ Automatically selected the parallels driver. Other choices: ssh, qemu2 (experimental) ❌ Exiting due to DRV_UNSUPPORTED_OS: The driver 'parallels' is not supported on darwin/arm64 $ minikube start --driver docker 😄 minikube v1.26.1 on Darwin 12.5.1 (arm64) ✨ Using the docker driver based on user configuration 💣 Exiting due to PROVIDER_DOCKER_NOT_RUNNING: "docker version --format -" exit status 1: Cannot connect to the Docker daemon at unix:///Users/jordiprats/.rd/docker.sock. Is the docker daemon running? 💡 Suggestion: Start the Docker service 📘 Documentation: https://minikube.sigs.k8s.io/docs/drivers/docker/There are several alternatives to Docker Desktop but the one that I found more convenient and easier to install is Colima
14/09/2022
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Setup EKS connector
3 min read
With the EKS connector you are going to be able to connect any Kubernetes cluster to the AWS EKS console to visualize it's status, configuration, nodes and workloads but not much else. Let's take a look what's needed:
12/09/2022
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OpenShift: Assign SCC to a SA
3 min read
If you try to create a pod with some privileges using the securityContext you are going to find out that it's not going to work on OpenShift as it would on a vanilla Kubernetes:
$ kubectl describe sts example-no-scc Name: example-no-scc (...) Events: Type Reason Age From Message ---- ------ ---- ---- ------- Warning FailedCreate 18s (x13 over 38s) statefulset-controller create Pod example-no-scc-0 in StatefulSet example-no-scc failed error: pods "example-no-scc-0" is forbidden: unable to validate against any security context constraint: [provider "anyuid": Forbidden: not usable by user or serviceaccount, spec.initContainers[0].securityContext.capabilities.add: Invalid value: "DAC_OVERRIDE": capability may not be added, spec.containers[0].securityContext.capabilities.add: Invalid value: "DAC_OVERRIDE": capability may not be added, spec.containers[1].securityContext.capabilities.add: Invalid value: "DAC_OVERRIDE": capability may not be added, provider "nonroot": Forbidden: not usable by user or serviceaccount, provider "hostmount-anyuid": Forbidden: not usable by user or serviceaccount, provider "machine-api-termination-handler": Forbidden: not usable by user or serviceaccount, provider "hostnetwork": Forbidden: not usable by user or serviceaccount, provider "hostaccess": Forbidden: not usable by user or serviceaccount, provider "node-exporter": Forbidden: not usable by user or serviceaccount, provider "privileged": Forbidden: not usable by user or serviceaccount]08/09/2022
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